header ul {
    background-color: lightblue;
}

main {
    margin-top:20px;
}

/* for Basic part */

.level3 {
    display: none;
}

/* for CDF part */

#cdf {
    display: none;
}

#tempcdf {
    display: none;
}

/* for Flow part */

#flow {
    display: none;
}

#flowstats {
    display: none;
}